JPH0926353A - Multifunction seismometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multifunctional seismometer with earthquake data analysis function, alarm function and communication function. SOLUTION: Distortion signals (natural frequency f1 -f7 ) from a sensor part 4 having sensors consisting of a dead-weight 1 (m1 -m7 ), a cantilever 2 and a distortion gauge 3, enters a converter 17 through an amplifier 5, and is converted into acceleration (α1 -α7 ), and then displayed on a display device. The signal f1 with the highest frequency out of the distortion signals is converted into the acceleration α1 with a converter 14, and a trigger 7 outputs trigger signal when the α1 is above a specified level, and an alarm buzzer 9, a flash light 10, an analog recorder 13 and a radio 15 are actuated. Further, since radio wave 18 is transmitted from a satellite transmitter 11 with the trigger signal, for actuating a car receiver 12, the coping with an earthquake is promptly done with a function which has not been so far.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-function seismometer which detects an earthquake and has functions such as alarm, recording, and communication.

[0002]

2. Description of the Related Art As typical examples of conventional seismometers, there are a rotating drum type seismometer shown in FIG. 5 and a moving coil type velocity seismometer shown in FIG. In the structure of the rotary drum type seismometer in FIG. 5, a movable mass 18 is supported by a support spring 19 on a base 20, and a needle 23 is attached to the movable mass 18. The needle 23 is a rotary drum supported on the base 20. It touches the surface of 17. In such a seismometer, the support spring 1
The movable mass 18 supported by 9 vibrates according to the magnitude of the earthquake, and its movement is recorded on the rotating drum 17 by the needle 23 attached to the tip of the movable mass 18.

In the structure of the moving coil type velocity seismometer shown in FIG. 6, the movable mass 18 is supported by the fixed portion 23 by the support spring 19, and the movable mass 18 is attached to the tip of the attaching member 24 attached to the movable mass 18. Magnet 21 with movable coil 22 fixed
It is movably inserted in the groove portion. In such a seismometer, the movable coil 22 attached to the tip of the attachment member 24 of the movable mass 18 moves in the magnet 21, and the magnitude of the shake is measured from the electromotive force generated by the electromagnetic induction action at that time.

As an application related to such a seismograph, Japanese Patent Application Laid-Open No. 60-177287 discloses an earthquake data recording device, and Japanese Patent Application Laid-Open No. 55-70685 discloses an elevator control operation system during an earthquake. No. 61-137026 discloses a vibration converter, but these conventional seismometers focus on the maximum values of vibration waveforms and amplitudes, and their focus is on improving the recording accuracy. It is expensive and does not have a function of analyzing the frequency component of the waveform or an alarm function.

[0005]

As described above, the conventional seismograph mainly attaches importance to the recording accuracy.
It does not have the frequency analysis of seismic motion and the display function of the analysis result. In addition, interlocking with an alarm function that uses sound and light,
The seismograph that has the function of linking with the broadcasting function of radio, etc. and the function of automatically contacting the car has not been realized. Further, it was very expensive because it focused on improving the recording accuracy.

[0006]

In order to solve such a problem, the present invention comprises a plurality of cantilever beams having a weight at the tip and a strain sensor at the base, each having a different natural frequency. Sensor unit, first and second converters for converting signals of the sensor unit, display device for displaying signals from the first converter, trigger for receiving and driving signals of the second converter, and drive by trigger signal And an alarm device, a broadcasting device, and a reception signal for an automobile as a warning device.

That is, the present invention is as follows: (1) A sensor unit comprising a weight attached to the tip and a strain sensor attached to the base, and a plurality of cantilever beams having different lengths and different natural frequencies depending on the weight. A first converter for inputting a strain signal from each of the strain sensors generated by different natural vibrations of the sensor unit and converting the strain signal into an acceleration signal; and a signal from the first converter. A display device that receives and displays an acceleration level due to each of the natural vibrations; and inputs a signal having the maximum natural frequency among the distortion signals from the sensor unit,
A second converter for converting into an acceleration signal; a trigger for receiving an acceleration signal from the second converter, comparing the signal with a predetermined trigger level, and outputting a drive signal when exceeding this level; There is provided a multifunctional seismometer, which is provided with an alarm means driven by a drive signal from a trigger.

(2) Further, as a concrete device of the alarm means of the invention of (1), a multifunctional seismometer characterized by being an alarm device such as a buzzer, a flashing lamp, or (3) a radio as the alarm means. , And other multifunctional seismometers, and (4) a multifunctional seismometer characterized by being an automobile receiver that operates by receiving a signal from an oscillator as an alarm means. provide.

According to the present invention, the weight of the tip of each cantilever vibrates in the invention of (1) when an earthquake occurs, and each cantilever has a different natural frequency. It vibrates and each strain sensor at its base detects its displacement. The strain signal of each of these strain sensors is input to the first converter, where the mass of the weight of each known cantilever, the length of the beam,
The diameter, Young's modulus, and second moment of area are converted into acceleration, which is input to the display device and the acceleration due to each natural vibration is displayed in a bar graph or the like.

On the other hand, the natural frequency can be set to an arbitrary value by adjusting the diameter, length, mass of the weight, second moment of area of the beam, etc. When the vibration frequency is set to the highest natural frequency, for example, 50 Hz, the acceleration of this vibration substantially matches the acceleration of seismic motion. Therefore, this acceleration can be used as a judgment signal such as an alarm. That is, the strain signal of the cantilever having the highest natural frequency is input to the second converter, converted into acceleration in the same manner as the first converter described above, and input to the trigger. In the trigger, this acceleration signal is compared with a preset trigger level, and if it exceeds this level, a drive signal is output, and the alarm means is activated by this drive signal to notify an earthquake. In addition, if necessary, the acceleration information may be recorded in an analog recorder or the like using this drive signal, which is useful for later analysis.

As a concrete device of this alarm means,
In the invention of (2), since it is an alarm device such as a buzzer, a blinking light, etc., the occurrence of an earthquake can be reliably notified by sound or light.

Further, in the invention of (3), since the alarm means is a broadcasting device such as a radio, broadcasting is started by a driving signal and the earthquake information is transmitted over a wide range by voice.

Further, in the invention of (4), since the alarm means is a receiver for an automobile, the driving signal from the trigger, for example, drives a transmitter for satellite communication and emits radio waves to drive the vehicle. Seismic information is transmitted by operating the receiver of the car.

[0014]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing the system configuration of a multifunction seismometer according to an embodiment of the present invention. In the figure, 1 is a weight, which is fixed to the tip of the cantilever 2. Reference numeral 3 is a strain gauge attached to the base of the cantilever 2, and is attached in two directions of an x direction and ay direction as shown by an arrow AA in FIG. The masses of the weights 1 are m _{1 to} m ₇ , and the masses are different from each other. are doing.

In these sensor units 4, x₁~ X₇
Is the displacement, I₁~ I₇Is the second moment of area, f₁~ F₇
Indicates the natural frequency, and the input ε of the converter 17 described later._x1
~ Ε _x7, Ε_y1~ Ε_y7Is the strain's x component, y component, α₁~ Α
₇Indicates the acceleration, respectively.

Reference numeral 5 is an amplifier for amplifying a signal from the sensor unit 4, 6 is a battery for driving the amplifier 5 and other devices, 7 is a trigger for generating a trigger signal, 8 is an acceleration signal from a converter 14 which will be described later. Trigger level for judging the magnitude, 9 is an alarm buzzer, 10 is an alarm blinking light, 11 is a satellite communication transmitter, 12 is a car receiver, 13 is an analog recorder, 14 is a converter, 15 is a radio, 16 is a display The device 17 is the above-mentioned converter, which inputs a distortion signal and converts it into an acceleration signal. Reference numeral 18 denotes a radio wave generated by the oscillator 11.

In the multifunctional seismograph having such a structure,
The sensor unit 4 is composed of the cantilever 2, the weight 1 and the strain gauge 3 attached to the root thereof as described above.
The strain signal is attached in two directions, ie, the y-direction and the y-direction. The obtained distortion signal is input to the amplifier 5 that operates on the battery 6, and is converted into an electric signal of an appropriate magnitude.

Among the converted distortion signals, only the one having the largest natural frequency is first subjected to vector combination of the values in the x and y directions by the converter 14 and then converted into the acceleration α ₁ .

When this α ₁ is input to the trigger 7 and exceeds a certain set level, a trigger signal is generated from the trigger 7, which causes the alarm buzzer 9, the alarm flashing lamp 10, the analog recorder 13, and the radio 15 to be broadcast at the same time. Works. Also,
At the same time, the satellite communication transmitter 11 is activated, and a radio wave 18 is still emitted toward the automobile and is received by the automobile receiver 12.

FIG. 3 is a waveform diagram of the acceleration signal output from the converter 14. A trigger level 8 is set, and when the set value is exceeded, the trigger 7 issues a trigger signal, and the buzzer 9, as described above, The blinking light 10, etc. are activated.

The total distortion signal is vector-synthesized from its x component and y component by the converter 17, and the acceleration signals α ₁ , α ₁ + α ₂ , α ₁ + α ₃ , α ₁ + α ₄ , α ₁ +
Converted to α ₅ , α ₁ + α ₆ , α ₁ + α ₇ , and display device 1
6, the maximum value is displayed as a bar graph.

FIG. 4 shows an example of the display of the display device 16 in which the accelerations with respect to the natural frequencies f _{1 to} f ₇ are displayed in the form of a bar graph.

Next, the operation of such an embodiment will be described in more detail. As shown in FIG. 2, strain gauges 3 are attached to the base of the cantilever 2 in the x and y directions.
Using the mass m of the weight, the second moment of area I, the Young's modulus E, the natural frequency f, the strain ε, the acceleration α, the length l of the cantilever, and the diameter d of the cantilever, the natural frequency f is It is expressed by the following equation (1).

[0024]

[Equation 1]

On the other hand, the acceleration α is expressed by the following equation (2).

[0026]

[Equation 2]

Here, ε in the above equation (2) is represented by the following equation (3).

[0028]

(Equation 3)

At the time of an earthquake, each weight 1 vibrates according to the equation of motion shown in the following equation (4).

[0030]

(Equation 4)

When the weight 1 vibrates and the displacement x occurs according to the above equation (4), a strain ε shown in the following equation (5) occurs at the base of the cantilever 2.

[0032]

(Equation 5)

After the distortion caused by the displacement x is amplified by the amplifier 5 as described above, the converter 14 vector-synthesizes the x component and the y component of the distortion according to the equation (3), and the acceleration from this distortion is obtained according to the equation (2). α is required.

A plurality of target natural frequencies f _{1 to} f ₇ are the diameter, length, and mass of the weight of the cantilever 2 according to the equation (1).
It can be arbitrarily set by adjusting the second moment of area. Here, the highest natural frequency f ₁ is 50H
When set to z, the acceleration α ₁ is almost the same as the acceleration at the time of the earthquake. Therefore, this acceleration α ₁ can be used as a judgment signal such as an alarm.

This acceleration α₁Is input to trigger 7, and
In trigger 7, as shown in ₁Is preset
If the trigger level 8 is exceeded, the alarm buzzer 9,
Alarm flashing light 10, analog recorder 13, radio 15
Send a trigger signal to activate them. Also satellite communication
Transmitter 11 starts up and sends electric wave 18 to the car
The receiver 12 receives this signal.

On the other hand, the accelerations α _{1 to} α ₇ obtained by the converter 17 are input to the display device 16, and the maximum value of the acceleration is displayed in a bar graph as shown in FIG. At this time, by convention, the acceleration values displayed in f _{1 to} f ₇ are α ₁ , α
₁ + α ₂ , α ₁ + α ₃ , α ₁ + α ₄ , α ₁ + α ₅ , α ₁
+ Α ₆ , α ₁ + α ₇ .

In the present embodiment, the converter 1
Although an example in which two converters are used in Nos. 4 and 17 has been described, one converter may have these functions.

The embodiment described above is summarized by the following features of the multifunction seismometer.

(1) In order to have a frequency analysis function,
Different natural frequencies f₁~ F ₇Weight at the tip with
1 (m₁~ M₇) Mounted cantilever 2 multiple
And feel the fixed part of the cantilever 2 in the X and Y2 directions.
Signals detected by attaching strain gauges 3
Is converted into an acceleration signal by the converter 17 and is converted according to the signal level.
A display device 16 for displaying acceleration is provided.

(2) In order to have an alarm function, the natural frequency f ₁ of the beam having the highest natural frequency among the above-mentioned plurality of cantilever beams 2 is input to the converter 14, and its acceleration is calculated, An alarm buzzer 9 and an alarm blinking lamp 10 which are operated by a trigger signal of the trigger 7 are provided. Furthermore, a function of transmitting an alarm to the radio 15 and an analog recorder 13 for data analysis are also provided.

(3) At the same time, a satellite communication oscillator 11 is also provided which emits a radio wave 18 by the signal of the trigger 7 and operates the vehicle receiver 12.

With the above-mentioned configurations (1), (2), and (3), a vibration analysis function at the time of an earthquake, an alarm function, and a communication function, which the conventional seismograph does not have, are provided, so that the response at the time of an earthquake is quick. It can be done.

[0043]

As described above in detail, according to the present invention, a sensor unit having a plurality of cantilever beams having a weight at the tip and a strain sensor at the base, each having a different natural frequency, First and second converters for converting the signal of the sensor unit, a display device for displaying the signals from the first converter, a trigger for receiving and driving the signal of the second converter, and an alarm means for driving with the trigger signal. Since the above-mentioned constitution and the constitution characterized by the alarm device, the broadcasting device, and the reception signal for the automobile are provided as a concrete device of the alarm means, the following effects can be obtained.

(1) Since the alarm means is provided, the occurrence of an earthquake of a predetermined size is notified at the same time as the occurrence of an earthquake, so that it is possible to respond quickly. Further, since the display device displays the acceleration level for each frequency component, for example, as a bar graph,
It is possible to immediately determine which frequency component is the largest during an earthquake. Further, if an analog recorder is operated by a trigger signal and acceleration information is recorded, later analysis is possible.

(2) When an alarm device is used as the alarm means, the alarm buzzer sounds and the alarm blinking light also flashes, so that it is possible to know the occurrence of an earthquake while sleeping, and even people who are deaf can hear an earthquake. You know what you have done and are ready to escape.

(3) When a broadcasting device such as a radio is used as the alarm means, activation of the radio can notify a wide range of occurrence of an earthquake and other information can be immediately obtained.

(4) When a car receiver is used as the alarm means, the seismic information level, which is generally difficult to understand while the car is running, can be known by satellite communication.

(5) Furthermore, since the seismograph of the present invention uses a sensor such as a strain gauge as the sensor unit, the overall cost is lower than that of the conventional seismograph.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a multifunction seismometer according to an embodiment of the present invention.

FIG. 2 is a view showing a state in which the strain gauge is attached in FIG.
It is an arrow view.

FIG. 3 is a waveform diagram of an acceleration signal which is an output of the converter shown in FIG.

FIG. 4 is a diagram showing a display example of a display device in FIG.

FIG. 5 is a configuration diagram of a conventional rotating drum type seismometer.

FIG. 6 is a configuration diagram of a conventional moving coil type velocity seismometer.

[Explanation of symbols]

 1 Weight 2 Cantilever 3 Strain gauge 4 Sensor section 5 Amplifier 6 Battery 7 Trigger 8 Trigger level 9 Alarm buzzer 10 Alarm flashing lamp 11 Satellite communication transmitter 12 Car receiver 13 Analog recorder 14, 17 Converter 15 Radio 16 display device 18 radio wave

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G08B 21/00 G08B 21/00 F

Claims (4)

[Claims] 1. A weight is attached to the tip and a strain sensor is attached to the base,
A sensor unit in which a plurality of cantilever beams having different natural frequencies depending on the length and the weight are arranged; and a strain signal from each strain sensor generated by a different natural vibration of the sensor unit is input, A first converter for converting these distortion signals into an acceleration signal; a display device for receiving the signal from the first converter and displaying the acceleration level due to each of the natural vibrations; each distortion signal from the sensor section A second converter for inputting a signal having the largest natural frequency among them and converting it into an acceleration signal; receiving an acceleration signal from the second converter, and comparing the signal with a predetermined trigger level. A multi-function seismometer, comprising: a trigger that outputs a drive signal when the level is exceeded; and an alarm means that is driven by the drive signal from the trigger. 2. The multi-function seismometer according to claim 1, wherein the alarm means is an alarm device such as a buzzer and a flashing light. 3. The multi-function seismometer according to claim 1, wherein the alarm means is a broadcasting device such as a radio. 4. The multi-function seismometer according to claim 1, wherein the alarm means is a vehicle receiver that operates by receiving a signal from an oscillator.